关于日期常用操作工具类
public class DateUtils { /** * 获取当前时间日期的字符串 */ public static String getCurrentDateStr(DateFormatType dateFormatType) { Date date = getCurrentDate(); return (String) OpearationDate(date, dateFormatType.getValue()); } /** * 时间、日期格式化成字符串 */ public static String formatDate(Date date, DateFormatType dateFormatType) { return (String) OpearationDate(date, dateFormatType.getValue()); } /** * 从字符串解析成时间、日期 */ public static Date parseDate(String dateStr, DateFormatType dateFormatType) { return (Date) OpearationDate(dateStr, dateFormatType.getValue()); } /** * 获取当前系统时间(原始格式) */ public static Date getCurrentDate() { Date date = new Date(System.currentTimeMillis()); return date; } /** * 获取当前日期的年、月、日、时、分、秒 */ public static int getCurrentTime(TimeFormatType timeFormatType) { return getTime(getCurrentDate(), timeFormatType); } /** * 获取指定日期的年、月、日、时、分、秒 */ public static int getTime(Date date, TimeFormatType timeFormatType) { try { Calendar c = Calendar.getInstance(); c.setTime(date); int type = timeFormatType.getValue(); int i = c.get(type); return type == 2 ? i + 1 : i; } catch (Exception e) { throw new RuntimeException("获取失败", e); } } /** * 获取指定日期的毫秒数 */ public static long getMillis(Date date) { java.util.Calendar c = java.util.Calendar.getInstance(); c.setTime(date); return c.getTimeInMillis(); } /** * 日期相加、减操作 * * 所返回结果单位为:天数 */ public static int operationDate(Date date, Date diffDate, DateOperationType dateOperationType) { long add = getMillis(date) + getMillis(diffDate); long diff = getMillis(date) - getMillis(diffDate); return (int) ((dateOperationType.getValue() ? add : diff) / (24 * 3600 * 1000)); } /** * 日期月份相加、减操作 */ public static Date operationDateOfMonth(Date date, int month, DateOperationType dateOperationType) { Calendar c = Calendar.getInstance(); c.setTime(date); c.add(Calendar.MONTH, dateOperationType.getValue() ? month : month - (month * 2)); return c.getTime(); } /** * 日期天数相加、减操作 */ public static Date operationDateOfDay(Date date, int day, DateOperationType dateOperationType) { Calendar c = Calendar.getInstance(); c.setTime(date); long millis = c.getTimeInMillis(); long millisOfday = day * 24 * 3600 * 1000; long sumMillis = dateOperationType.getValue() ? (millis + millisOfday) : (millis - millisOfday); c.setTimeInMillis(sumMillis); return c.getTime(); } private static Object OpearationDate(Object object, String formatStr) { if (object == null || null == formatStr || "".equals(formatStr)) { throw new RuntimeException("参数不能为空"); } SimpleDateFormat format = new SimpleDateFormat(formatStr); try { if (object instanceof Date) return format.format(object); else return format.parse(object.toString()); } catch (Exception e) { throw new RuntimeException("操作失败", e); } } public enum DateOperationType { /** * 加操作 */ ADD(true), /** * 减操作 */ DIFF(false); private final boolean value; DateOperationType(boolean operation) { this.value = operation; } public boolean getValue() { return value; } } public enum TimeFormatType { YEAR(1), MONTH(2), DAY(5), HOUR(11), MINUTE(12), SECOND(13); private final int value; TimeFormatType(int formatStr) { this.value = formatStr; } public int getValue() { return value; } } public enum DateFormatType { /** * 格式为：yyyy-MM-dd HH:mm:ss */ DATE_FORMAT_STR("yyyy-MM-dd HH:mm:ss"), /** * 格式为：yyyyMMddHHmmss */ SIMPLE_DATE_TIME_FORMAT_STR("yyyyMMddHHmmss"), /** * 格式为：yyyy-MM-dd */ SIMPLE_DATE_FORMAT_STR("yyyy-MM-dd"), /** * 格式为：yyyy/MM/dd */ SIMPLE_DATE_FORMAT_VIRGULE_STR("yyyy/MM/dd"), /** * 格式为：HH:mm:ss */ HOUR_MINUTE_SECOND("HH:mm:ss"), /** * 格式为：HH:mm */ HOUR_MINUTE("HH:mm"); private final String value; DateFormatType(String formatStr) { this.value = formatStr; } public String getValue() { return value; } } } ?